About Slewing Bearing Grease
Table of Contents
What is the purpose of slewing bearing grease? grease method?
Rolling bearings are precision parts and are lubricated before leaving the factory. No matter how high-performance bearings are used, if the lubrication is not in place, it will not only fail to achieve the expected high performance, but also affect the service life of the bearings.
First, the purpose of slewing bearing grease
The purpose of slewing bearing grease is to reduce the internal friction and wear of the bearing, prolong the service life, cool the harvest, prevent burning, rust, and prevent foreign objects from invading the inside of the bearing.
1. Reduce friction and wear
In the mutual contact part of the bearing ring, rolling element and cage, prevent metal contact, reduce friction and wear.
2. Extend the service life of bearings
Bearings are prone to fatigue life in high-speed operation, and the use of lubricating grease can prolong the service life of bearings.
3. Discharge friction heat and cool bearings
Circulating oil supply method, etc., can use oil to discharge heat generated by friction, or heat from outside, and cool it. Prevent the bearing from overheating and prevent the aging of the lubricating oil itself.
4. Other functions
High and low temperature, corrosive environment, humid environment, water drenching environment, etc., these are all easy to cause the production of foreign bodies, the rust of bearings, and the corrosion of their own bearings. The best slewing bearing grease can prevent foreign matter from intruding into the interior, preventing rust and corrosion of the bearing.
2.Lubrication method of bearings
The lubrication methods of bearings are mainly grease lubrication and oil lubrication. In order to make the bearing function well, first of all, it is necessary to select a lubrication method suitable for the conditions of use and the purpose of use.
If only lubrication is considered, the lubricity of oil lubrication is dominant. However, grease lubrication has the advantage of simplifying the structure around the bearing. Compare the advantages and disadvantages of grease lubrication and oil lubrication.
At present, oil lubrication is mostly used, among which oil and gas lubrication is very popular. Oil-air lubrication is a new lubrication method that has gradually become popular in recent years.
It is fundamentally different from other lubrication methods in that it can control the oil supply and achieve an ideal lubrication effect. Therefore, in recent years, oil-air lubrication has gradually replaced other lubrication methods.
3. Filling of slewing bearing grease
1. Filling with grease
After the bearing is installed, it needs to be supplemented with grease before running. When filling the grease, the bearing should be rotated while filling to make the grease evenly distributed until the grease overflow is observed at the lip of the sealing strip on the bearing.
2. Daily automatic grease injection
After the grease is injected, the automatic grease injection system can be turned on, and a certain amount of grease can be injected every day (regularly) to meet the normal use of the bearing. The amount of grease injected for two months should at least reach the internal cavity volume of the slewing bearing.
In order to ensure that sufficient grease enters Bearings, on the one hand, pay attention to the consumption of grease, and on the other hand, regularly check the oil circuit to prevent leakage.
Every three months or so, a concentrated grease injection should be carried out inside the slewing bearing, and a large amount of grease should be injected into the upper grease injection hole until the lip of the upper sealing strip evenly overflows with fresh grease.
4, three-row roller slewing bearing grease
The bearing structure has the largest cavity in the upper row of the main stress-bearing raceway, and the upper row of raceway grease will move to the lower row of raceways during operation.
The amount of grease injected into the upper row should be appropriately increased. 130% of the fat mass.
5. What are the commonly used greases for slewing bearings?
The commonly used lubricating greases are calcium-based grease, lithium-based grease, aluminum-based grease and high-temperature grease, etc. The user can choose the appropriate grease according to the specific situation.
